<template>
    <div class="sidebar">
        <el-menu class="sidebar-el-menu" :default-active="onRoutes" :collapse="collapse" background-color="#324157"
            text-color="#bfcbd9" active-text-color="#20a0ff" unique-opened router>
            <template v-for="item in menuList">
                <template v-if="item.subs">
                    <el-submenu :index="item.index" :key="item.index">
                        <template slot="title">
                            <i :class="item.icon"></i><span slot="title">{{ item.title }}</span>
                        </template>
                        <el-menu-item v-for="(subItem,i) in item.subs" :key="i" :index="subItem.index">
                            {{ subItem.title }}
                        </el-menu-item>
                    </el-submenu>
                </template>
                <template v-else>
                    <el-menu-item :index="item.index" :key="item.index">
                        <i :class="item.icon"></i><span slot="title">{{ item.title }}</span>
                    </el-menu-item>
                </template>
            </template>
        </el-menu>
    </div>
</template>

<script>
import bus from './bus'
 import { mapState } from 'vuex'
export default {
  data () {
    return {
      collapse: false,
      items: [
        {
          icon: 'el-icon-setting',
          index: 'index',
          title: '系统首页'
        },
 
        {
          icon: 'el-icon-error',
          index: '404',
          title: '404页面'
        }
      ]
    }
  },
  computed:mapState({
      menuList: state=>state.menu.menuList,        
            onRoutes(){     
                return this.$route.path.replace('/','');
            }
     }),
  created () {

      console.log(mapState);
    // 通过 Event Bus 进行组件间通信，来折叠侧边栏
     bus.$on('collapse', msg => {
        this.collapse = msg;
    })
  }
}
</script>

<style scoped>
    .sidebar{
        display: block;
        position: absolute;
        left: 0;
        top: 70px;
        bottom:0;
        overflow-y: scroll;
    }
    .sidebar::-webkit-scrollbar{
        width: 0;
    }
    .sidebar-el-menu:not(.el-menu--collapse){
        width: 250px;
    }
    .sidebar > ul {
        height:100%;
    }
</style>
